Abstract: Using the method of nutritional solution culture, the effect of aeration on growth. physiological and biochemical properties and the rectification method of aluminum toxicity of Longan were studied under aluminum stress. The results were as follows: Aeration could rectify the aluminum toxicity and promoted the Longan growth. Compared with non-aeration, the biomass of root, stern, and leaves and the vitality of root was enhanced 20. 1%～41.0%, 23. 9%～59. 2%,26. 5%～126. 9%,62. 9%～322. 3%respectively. And aeration was helpful for reducing or eliminating the effects of photosynthesis which suffered from aluminum toxicity to Longan. Under the aeration condition, Chla, Chlb, Car were improved 129.2%～492. 8%,120.2%～463. 0%,111. 9%～328. 0%, Pn and CE were remarkable higher than that of non-aeration too. the leakage value OD254 in leaves was reduced 34.4%～48.6%, and the activity of NR was enhanced 18. 1%～53.6%,which promoted Longan to absorb and utilize N. Aeration condition also reduced the degree of damage to membrane sys tern of cell. Aluminum ion could combine and PO3-4 and citric acid forming unsolvable deposition and reducing toxicity. The main cause of aluminum toxicity was to prevent plants to absorb Ca and Mg. Therefore, application of phosphor, calcium, and magnesium could reduce the aluminum toxicity. The results also showed that CaCI2, KH～PO4, MgSO4 and citric acid could hinder Longan A1. The contents of aluminum in root, stem, and leaves were reduced compared with CK.